package com.kuang.config;

import com.kuang.pojo.User;
import com.kuang.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * @description:
 * @author: KeepFresh
 * @time: 2021/4/11 20:15
 */
// 自定义的 UserRealm extends AuthorizingRealm
public class UserRealm extends AuthorizingRealm {

    @Autowired
    UserService userService;

    // 授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("执行了授权=》doGetAuthorizationInfo");
        // SimpleAuthorizationInfo
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        info.addStringPermission("user:add"); // 给用户增加user:add权限

        // 拿到当前登录的这个对象
        Subject subject = SecurityUtils.getSubject();
        User currentUser = (User) subject.getPrincipal(); // 拿到User对象

        // 设置当前用户的权限
        info.addStringPermission(currentUser.getPerms());

        return info;
    }

    // 认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        System.out.println("执行了认证=》doGetAuthorizationInfo");

        // 用户名，密码：数据库中取
//        String name = "root";
//        String password = "123456";

        // 连接真实的数据库
        UsernamePasswordToken userToken = (UsernamePasswordToken) token;
        User user = userService.queryUserByName(userToken.getUsername());
        if (user == null) { // 没有这个人
            return null;
        }

        if (!userToken.getUsername().equals(user.getName())) {
            return null; // 抛出异常  UnknownAccountException
        }

        Subject currentSubject = SecurityUtils.getSubject();
        Session session = currentSubject.getSession();
        session.setAttribute("loginUser", user);

        // 可以加密：MD5:   MD5盐值加密：
        // 密码认证，shiro做，加密了
        return new SimpleAuthenticationInfo(user, user.getPwd(),"");
    }
}
